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I last accessed my time machine on the 19th May and successfully recovered a file that was created on 15th May. Later that day I switched my External Time machine disk off.

Today, I've just gone into Time Machine (yes after turning my disk back on before you ask) and the latest backup is dated 4 May. I've checked the disk via Finder and sure enough there is nothing after 4 May even though TM ran normally between then and the 19th. This was vital as I've been working on a critical project.

Anyone any ideas how TM has lost files? Incidentally, backups from April and March are still there.

If nothing suspicious, launch a new TM backup and watch the logs in real time, it might be that TM needs to do a rebuild of its database.

Cheers ... McBie

A computer lets you make more mistakes faster than any invention in human history - with the possible exceptions of handguns and tequila.
The bitterness of poor quality remains long after the sweetness of low price is forgotten.

Thanks cwa107 and McBie. Just to clarify the points raised. The project completed on the 19th and as I wasn't going to be doing anything other than surf the net I ejected the drive before turning off. Actually, thinking about it after ejecting the drive I didn't switch it off as today I just "reintroduced to the mac" (by pressing the encryption button - its a freecom hard drive pro).

This pm ran Time machine manually and it's now showing that there is backup timed at 14:05 today so I'll leave it on auto and see what develops.

A computer lets you make more mistakes faster than any invention in human history - with the possible exceptions of handguns and tequila.
The bitterness of poor quality remains long after the sweetness of low price is forgotten.